[v6.6] WARNING in inet_sock_destruct

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 60a9e718726f Linux 6.6.106
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15c3147c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=12606d4b8832c7e4
dashboard link: https://syzkaller.appspot.com/bug?extid=760a14df6e917e1c4c61
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/eca27e056a5a/disk-60a9e718.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bc64d4eeb7f6/vmlinux-60a9e718.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a345041561ac/bzImage-60a9e718.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+760a14...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 1305 at net/ipv4/af_inet.c:155 inet_sock_destruct+0x689/0x7a0 net/ipv4/af_inet.c:155
Modules linked in:
CPU: 1 PID: 1305 Comm: kworker/u4:8 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:inet_sock_destruct+0x689/0x7a0 net/ipv4/af_inet.c:155
Code: ff ff e8 da 82 85 f8 0f 0b e9 48 fe ff ff e8 ce 82 85 f8 0f 0b 41 80 3c 1c 00 0f 85 74 fe ff ff e9 77 fe ff ff e8 b7 82 85 f8 <0f> 0b e9 dd fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 38 fc ff
RSP: 0018:ffffc900001f0be8 EFLAGS: 00010246
RAX: ffffffff89000d89 RBX: dffffc0000000000 RCX: ffff888023ffbc00
RDX: 0000000000000100 RSI: 0000000000000fff RDI: 0000000000000000
RBP: 0000000000000fff R08: ffff88802cd2dd77 R09: 1ffff110059a5bae
R10: dffffc0000000000 R11: ffffed10059a5baf R12: ffff88802cd2db00
R13: 1ffff110059a5b62 R14: ffff88802cd2dd28 R15: ffffffff8e0d59a0
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f44bdf056c0 CR3: 0000000018efa000 CR4: 00000000003506e0
Call Trace:
<IRQ>
__sk_destruct+0x83/0x640 net/core/sock.c:2191
rcu_do_batch kernel/rcu/tree.c:2194 [inline]
rcu_core+0xcc4/0x1720 kernel/rcu/tree.c:2467
handle_softirqs+0x280/0x820 kernel/softirq.c:578
do_softirq+0xed/0x180 kernel/softirq.c:479
</IRQ>
<TASK>
__local_bh_enable_ip+0x178/0x1c0 kernel/softirq.c:406
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_nc_purge_paths+0x311/0x3a0 net/batman-adv/network-coding.c:471
batadv_nc_worker+0x328/0x610 net/batman-adv/network-coding.c:720
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 60a9e718726f Linux 6.6.106
git tree: linux-6.6.y

console output: https://syzkaller.appspot.com/x/log.txt?x=15810e42580000

kernel config: https://syzkaller.appspot.com/x/.config?x=12606d4b8832c7e4
dashboard link: https://syzkaller.appspot.com/bug?extid=760a14df6e917e1c4c61
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11fcbb12580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15fcbb12580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/eca27e056a5a/disk-60a9e718.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bc64d4eeb7f6/vmlinux-60a9e718.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a345041561ac/bzImage-60a9e718.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+760a14...@syzkaller.appspotmail.com

------------[ cut here ]------------

WARNING: CPU: 0 PID: 16 at net/ipv4/af_inet.c:155 inet_sock_destruct+0x689/0x7a0 net/ipv4/af_inet.c:155
Modules linked in:
CPU: 0 PID: 16 Comm: ksoftirqd/0 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025

RIP: 0010:inet_sock_destruct+0x689/0x7a0 net/ipv4/af_inet.c:155
Code: ff ff e8 da 82 85 f8 0f 0b e9 48 fe ff ff e8 ce 82 85 f8 0f 0b 41 80 3c 1c 00 0f 85 74 fe ff ff e9 77 fe ff ff e8 b7 82 85 f8 <0f> 0b e9 dd fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 38 fc ff

RSP: 0018:ffffc900001579a8 EFLAGS: 00010246
RAX: ffffffff89000d89 RBX: dffffc0000000000 RCX: ffff88801be4da00

RDX: 0000000000000100 RSI: 0000000000000fff RDI: 0000000000000000

RBP: 0000000000000fff R08: ffff88802d27b677 R09: 1ffff11005a4f6ce
R10: dffffc0000000000 R11: ffffed1005a4f6cf R12: ffff88802d27b400
R13: 1ffff11005a4f682 R14: ffff88802d27b628 R15: ffffffff8e0d59a0
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000055555c59f5c8 CR3: 0000000018ecf000 CR4: 00000000003506f0
Call Trace:
<TASK>

__sk_destruct+0x83/0x640 net/core/sock.c:2191
rcu_do_batch kernel/rcu/tree.c:2194 [inline]
rcu_core+0xcc4/0x1720 kernel/rcu/tree.c:2467
handle_softirqs+0x280/0x820 kernel/softirq.c:578

run_ksoftirqd+0x9c/0xf0 kernel/softirq.c:950
smpboot_thread_fn+0x635/0xa00 kernel/smpboot.c:164

kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>


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